Intravenous needle and holder assembly

ABSTRACT

In an intravenous needle and needle holder assembly, the needle can be moved between a retracted position in which it has a substantially rigidified junction with the holder to facilitate insertion in a patient&#39;s blood vessel, and an extended position in which a length of flexible tubing on which the needle is mounted becomes exposed from the holder to allow a degree of lateral movement of the holder after the needle has been inserted thereby aiding in immobilizing the holder on a patient&#39;s arm and preventing dislocation of the needle.

FIELD OF THE INVENTION

This invention relates generally to the field of intravenous fluid administration, and more particularly to an assembly of an intravenous needle and needle holder which, inter alia, facilitates needle insertion and enhances user comfort.

BACKGROUND OF THE INVENTION

Intravenous fluids are being utilized with increasing frequency, and generally are administered through a conventional steel needle or an intravenous catheter. Steel needles are less irritating to veins than catheters but are difficult to immobilize if rigidly connected to a holder. The use of a syringe for insertion of a needle, necessitates disconnecting the needle and its associated attachments to the intravenous tubing, which frequently dislocates the needle. The use of catheters, on the other hand, is associated with a significant increase in the incidence of phlebitis.

SUMMARY OF THE INVENTION

It is an object of the invention to provide an intravenous needle and holder assembly which overcomes previously encountered difficulties with the insertion and immobilization of such needles.

Another object of the invention is to provide an intravenous needle and holder assembly which has different insertion and administration modes, so as to facilitate insertion and aid in immobilization of the needle.

In accordance with the invention, an intravenous needle and holder assembly includes an outer case having a forward end with a small needle-receiving bore formed therein, and an open back end, an inner case for connection of intravenous tubing, the inner case having a forward end connected to an intravenous needle by a length of flexible tubing, the inner case being receivable in the outer case with the needle projecting through said bore, the assembly having an insertion orientation wherein the needle projects only partially from said bore so as to provide a substantially rigidified junction with the outer case, and the assembly having an administration orientation wherein the the outer case is withdrawn along the inner case to expose at least part of said length of flexible tubing from the forward end of the inner case and provide a substantially flexible junction between the needle and the outer cased permitting movement of the outer case relative to the needle thereby facilitating immobilization of the outer case.

There may be a screw-thread connection between the inner and outer cases for securing these together in the administration orientation of the assembly, and the outer case may be contoured to facilitate handling and immobilization on a patient's arm. The back end of the inner case may be formed as a socket to receive a push-in fitting at the leading end of the intravenous tubing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view from one side of an intravenous needle and holder assembly in an insertion orientation;

FIG. 2 is a perspective view from the other side of the assembly in an administration orientation;

FIG. 3 is an exploded sectional elevational view of the assembly;

FIG. 4 is a plan view of the assembly in the administration orientation;

FIG. 5 is a sectional view on line 5--5 of FIG. 4;

FIG. 6 is a perspective view from below of the assembly, in the administration orientation and part broken away; and

FIG. 7 is a sectional plan view of the assembly in the administration orientation, showing how the needle can be moved relative to the outer case.

ESCRIPTION OF PREFERRED EMBODIMENT

An intravenous needle and holder assembly as illustrated comprises an elongate outer cans 10, with an open back end 12 and a tubular front end 14 with a restricted bore 16, (FIG. 3), an elongate tubular inner case 18 which fits in the outer case, a length of flexible tubing 20 extending from a forward end of the inner case, and a conventional type of steel or other intravenous needle 22 at a forward end of the tubing. The inner case has a through-bore 24 communicating with a through-bore 26 in tubing 20, and another through-bore (not shown) in the needle. The inner and outer cases conveniently may be of molded plastic, and the tubing 20 may be bonded or welded to the inner case and the needle in known manner.

The relative dimensions of the parts is such that needle 22 can be inserted into the outer case 10 from its back end, and pushed through bore 16 so that only a portion of the needle projects from the front of end 14 of the outer case, as shown in FIG. 1. This is the insertion orientation of the assembly, and it will be readily understood that in this orientation, there is a substantially rigidified junction between needle 22 and front end 14 of the outer case, substantially preventing any lateral displacement of the needle relative to the outer case and thereby stabilizing same to facilitate insertion of the needle into a patient's blood vessel. To further facilitate manipulation of the assembly, outer case 10 may have a thumb indentation 28 on one side and a longer finger indentation 30 on the other side.

Once the needle has been inserted in a patient's blood vessel, outer case 10 can be drawn backwardly along the inner case to an administration orientation of the assembly exposing tubing 20 from the forward end 14 of the outer case as shown, for example, in FIG. 2, 4 and 7. This allows the outer case to pivot laterally relative to the needle about the tubing (see FIG. 7) thereby facilitating immobilization of the outer case by adhesive tape or the like on the patient's arm. The outer case may have a further elongate indentation or flat 32 on the bottom to aid in conforming to the contours of the arm and promote stabilization of the case on the patient.

It will further be noted that the back end of the inner case 18 is formed as a cap-like member 34 with internal threads 36 which can be threaded on complimentary external threads 38 on the outer case to lock the assembly in the administration orientation. Also, the back end of inner case 18 may be formed with a socket 40 to receive a press-in fitting of an intravenous tube. A removable needle cap 42 may also be provided.

It is apparent that the invention accordingly provides an intravenous needle and holder assembly which can be readily converted as between an insertion position wherein the needle is held substantially rigidly, and an administration position wherein a degree of flexibility is afforded between the needle and holder, to allow for some shifting of the holder, in use, without dislocating the needle or shifting in position of the needle with consequent alteration in the rate of intravenous fluid flow.

While an only a preferred embodiment of the invention has been described herein in detail, the invention is not limited thereby and modifications can be made within the scope of the attached claims. 

What is claimed is:
 1. an intravenous needle and holder assembly having an outer case, an intravenous needle for receipt in the outer case with at least a part of the needle projecting from a forward end of the case, and adjustment means attached to a back end of the needle for selectively establishing an insertion orientation of the assembly having a substantially rigified junction between the needle and the case effectively preventing lateral movement of the case, relative to the needle, and an administration orientation of the assembly having a flexible junction between the needle and the case allowing lateral movement of the case relative to the needle.
 2. The invention as defined in claim 1 wherein the adjustment means includes a length of flexible tubing, the needle being movable along a bore in the forward end of the case between a first position establishing the insertion orientation of the assembly wherein only a part of the needle protrudes from the forward end of the case, and a second position establishing the administration orientation of the assembly wherein the entire needle and at least part of said flexible tubing protrudes from the forward end of the case.
 3. The invention as defined in claim 2 further including an inner case attached to a back end of said tubing for receipt in the outer case and for connection to intravenous tubing.
 4. The invention as defined in claim 3 including connector means between the inner case and outer case for releasably locking the assembly in the administration orientation.
 5. The invention as defined in claim 4 wherein the connector means comprises a cap formation on the inner case, an internal thread on said cap formation and a corresponding external thread on the outer case.
 6. The invention as defined in claim 2 including a socket in the inner case for receiving a press-in fitting on intravenous tubing.
 7. The invention as defined in claim 1 including thumb and finger indentations on the outer case to facilitate insertion of the needle in a patient's blood vessel.
 8. The invention as defined in claim 7 further including a flattened surface on the outer case to facilitate immobilization of the outer case on a patient's arm.
 9. An intravenous needle and holder assembly including an outer case having a forward end with a small needle-receiving bore formed therein and an opened back end, an inner case for connection to intravenous tubing, th inner case having a forward end connected to an intravenous needle by a length of flexible tubing, the inner case being receivable in the outer case with the needle projecting through said bore, the assembly having an insertion orientation wherein the needle projects only partially from said bore so as to provide a substantially rigidified junction with the outer case, and the assembly having an administration orientation wherein the outer case is withdrawn along the inner case to expose at least part of said length of flexible tubing from the forward end of the outer case and provide a substantially flexible junction between the needle and the outer case permitting movement of the outer case relative to the needle thereby facilitating immobilization of the outer case.
 10. The invention as defined in claim 9 including a screw-threaded connection between the inner case and the outer case for securing the cases together in the administration orientation of the assembly.
 11. The invention as defined in claim 9 wherein the outer case is contoured to facilitate handling and immobilization on a patient's arm.
 12. The invention as defined in claim 9 including a socket formation at a back end of the inner case to receive a push-in fitting at the leading end of intravenous tubing. 